Positive displacement flowmeters flowmeters oval product. Many types of positive displacement flowmeters are used in the industry. Positive displacement type flow meter applications of positive displacement meters. The brodie 9400 series oval flow meters are mechanical, positive displacement meters designed for use in the chemical processing, industrial, food and beverage and hydrocarbon processing industries. Whether you need a single instrument or a complete instrumentation package, siemens is your professional supplier for any project. Positive displacement flow meter for fuels and oils positive displacement flowmeter for industrial processes the level of recommended maintenance is heavily influenced by the application. Kobold don series oval gear flow meters manual pdf instrumart. Our emerson mining advisor applications will be on display. We have flow meters made from aluminium, stainless steel and plastic.
Mar 23, 2018 positive displacement flow meters are the only flow measuring instrument that can directly measure the volume of liquid passing though the flow meter. Floco f series meter performs easily in high viscosity fluids and is ideal for raw crude oil, production oils and grease, paints and coatings and even paraffin. A 15 second video demonstrating positive displacement flow meter calibration for a low flow oil application. Positive displacement flow meters omega engineering. The oval gear flow meters are virtually unaffected by changes in viscosity maintaining their accuracy as low as 0. They are named after the mechanical device inside the chamber. Therefore, flow technology has removed all but the most. The positive displacement flow meter has an advantage in that it requires no external power, and unlike other flow technologies, requires no fully developed flow profile for accurate flow measurement which can be accurate up to 0. The volume flow rate can be calculated from the revolution rate of the mechanical device. The smaller these clearances are, relates to how high the accuracy will be. Along with the smooth oval rotors, exceptional repeatability and. Ifc inflow offers positive displacement flow meter. They can be used in very viscous, dark colored fluids.
Flow meter resources flow meter application advisor. Positive displacement flow meters are the only flow measuring technology to directly measure the volume of fluid that passes though the flow meter. Lessons about positive displacement flow meters omega. Positive displacement flow meters are designed for low flow and high accuracy over a wide range of fluid viscosity generally used for thicker liquids they can be used in very viscous, dark colored fluids meter requires fluid to mechanically displace components in the meter. It achieves this by trapping pockets of fluid between rotating components housed within a high precision chamber. Positive displacement flow measurement technology accurately measures the volume of liquid or gas passing through the flow meter. The differential pressure flow measuring principle pitot tube duration. Magnets embedded within the gears initiate a high resolution pulse train output. Positive displacement flow meter description our positive displacement flow meter is a kind of oval gear flow meter,along to positive displacement flow meter. The measuring chamber of the isolv birotator positive displacement flowmeter consists of a body, a pair of rotor gear and a top cover. These positive displacement flow meter companies can design, engineer and manufacture positive displacement flow meters to your specifications and application need.
Flowrate is calculated from the number of revolutions of a rotors activated by the energy of fluid. The reasons companies standardize on our meters are simple. Positive displacement flow meters for water and solventbased paints and coatings starting at. With only 2 moving parts, the positive displacement meter offers trouble free operation and long service life. Positive displacement gear flow meters can be installed either a horizontal or vertical flow up orientation. This sealing effect provides for greater flow measurement accuracy. Positive displacement flow meters are designed for low flow and high accuracy over a wide range of fluid viscosity generally used for thicker liquids. A cavity with a known volume is formed and functions as the measuring chamber of the flowmeter. The oval gear meters are positive displacement flowmeters where the passage of liquid causes two oval gears to rotate within a precision measuring chamber and with each rotation a fixed volume of liquid passes through the meter. Applications, advantages and disadvantages of positive. When liquid flows through this type of positive displacement flowmeter, two oval geared rotors measure a constant volume per rotation within a precisely machined measuring chamber. The movement of gear is measured by means of a pickup sensor located in the cover. In principle, positive displacement flowmeter requires no external energy such as electricity. Inside the chamber, a rotatingreciprocating mechanical unit is placed to create fixedvolume discrete parcels from the.
Generally, positive displacement flowmeter offers high accuracy measurement and is suitable for totaling the flowrate. Positive displacement flowmeter technology flowmeters. Industrial flow measurement industrial flow measurement. Magnets imbedded in the impellers activate a nonintrusive sensor which generates a pulsed output signal. Aw gear meters microflow positive displacement flow meter. Siemens offers a comprehensive range of process equipments for pressure, temperature, flow and level measurement.
For example if a flow meter is processing a fluid that displays lubricating properties i. Macnaught positive displacement flow meters flow rate range selection chart figure 4. Rotating positive displacement flow meters one of the main benefits of using a pd flow meter is the high level of accuracy that they offer, the high precision of internal components means that clearances between sealing faces is kept to a minimum. Simplicity of design and construction ensures unmatched accuracy and troublefree operation over long periods of use. Check that actual flow direction is the same indicated by the arrow stamped on the flowmeter outer housing andor is in accordance to the in and out nameplates attached to the inlet and outlet flanges of the flowmeter itself. Positive displacement flow meter with flow range from 0. Positive displacement flow meters dce series pd meter flow technology has taken its patented flowmeter design and made it simpler.
A positive displacement meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement. Series pdm flowmeter outputs reed switch output provides a voltage free contact closure. The positive displacement or oval gear principle is a simple. Positive displacement measuring principle gas flow meters. Fhg flow meters measure the flow rate based on the screw pump principle. Meter requires fluid to mechanically displace components in the meter. The force of the liquid moving through the flowmeter drives the measuring gears. Applications include lubricants, fuels, chemicals and solvents, oils and greases.
Onsite calibration of flow metering systems installed in. Positive displacement flow meter the dom series positive displacement flowmeter is the preferred choice for measuring viscous liquids such as lubricatinghydraulic oils, diesel fuels, chemicals, solvents, resins, and pastes. A positive displacement flow meter measures flow by displacing a precise and known volume for each revolution of their internal parts. The negative error is compensated by an adjustment.
The meter is bidirectional and it has an extremely large turndown ratio, up to. Hydraulic testing, chemical injection or chemical dosing, pharmaceutical application and similar precision applications. Only fluid that is able to bypass this seal does not get counted, this is. The pd flow meter derives the power necessary to work from the energy contained in the flow process.
Through the use of omegas accessory dpf701 panel meter, the frequency output can be. Positive displacement flow meters are precision made liquid measuring flow meters. The liquid stream is divided into the fixed volume cavities between the gear teeth and metering body. The honeywell versaflow vortex flowmeter has integrated pressure and temperature compensation in 2wire technology, providing maximum performance at the lowest installed cost. A pair of rotors fitted precisely into the housing constitutes the measuring element. These are available in single, double and triple capsule models to suit applications covering a wide range of flow capacities. Rotating positive displacement meters one of the main benefits of using a pd flow meter is the high level of accuracy that they offer, the high precision of internal components means that clearances between sealing faces is kept to a minimum. Positive displacement pd flow meters flow heaters technology overview positive displacement pd flow meters are the only flow measuring technology to directly measure the volume of fluid that passes though the flow meter. By directing the fluid to mechanically displace components in the meter in order to measure its flow as discreet parcel volumes.
A pressure relative to the existing atmospheric pressure, using negative values to. Each company has detailed profile information, locations, phone number, website links, product videos and product information defined. Positive displacement flow meter, master pd flowmeters. A meter may be subjected to an overspeed condition due a varying load condition creating a sudden drop in downstream pressure, which in turn cause a decrease in meter s maximum operating capacity.
Many customers do not need the wide array of options that the dci series offers. Positive displacement flow meter flow meter directory. A basic analogy would be holding a bucket below a tap, filling it to a set level. They are used in high viscous, dirty fluid which does not flow through the straight conduit. Barton floco and flotrac meters excel in harsh environments.
Series pdm flowmeter principle of operation the series pdm flowmeter uses the oscillating piston principle where the passage of liquid causes a piston to oscillate smoothly in a circular motion within the measuring chamber. You can measure flow through a variety of different devices such as coriolis, differential pressure, vortex, magnetic, ultrasonic, turbine and positive displacement meters. A quick and easy to use request for quote form is provided for you to contact these positive displacement flow meter manufacturers and suppliers. Positive displacement meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement. Understanding how a positive displacement flow meter works. Only fluid that is able to bypass this seal does not get counted, this. The pd flowmeter must be mounted with the rotor shafts in horizontal position. Positive displacement flowmeters introduction to continuous fluid. Browse online, or one of our applications engineers can help you choose the right product for your application. Every cycle of the meter s mechanism displaces a precisely defined positive quantity of fluid, so that a count of the number of mechanism cycles yields a precise quantity for the total fluid volume passed through the flow meter.
Additional positive displacement flow meter manufacturers. Jul 03, 20 a 15 second video demonstrating positive displacement flow meter calibration for a low flow oil application. The flomec positive displacement flow meter range is available in small, medium and large capacity models from 18. Diameter and can be supplied with pulsed output, local display and with most versions a mechanical display. Principle of operation flow technologys positive displacement flowmeters use two rotating, thermoplastic impellers driven by the flowing liquid. Positive displacement flow meter positivedisplaceme ntflowmeter. There are many types of internals such as two or three gear oval gear, nutating disc, rotary piston and sliding vane. These meters achieve this by trapping small amounts of fluid between rotating components within a high precision chamber. A positive displacement flow meter is a cyclic mechanism built to pass a fixed volume of fluid through with every cycle.
Siemens sitrans flow meter positive displacement pd. A positive displacement flowmeter is a cyclic mechanism built to pass a fixed volume of fluid through with every cycle. Positive displacement flow meter, master pd flowmeters, preset batching flowmeter, tank truck loading flowmeter, manufacturer, supplier, pune, maharashtra, india. Positive displacement flow meter what it is and how does. Gpi flomec om oval gear flowmeter training manual lesman. Introduction to positive displacement flowmeters pd. A meter may be subjected to an overspeed condition due a varying load condition creating a sudden drop in downstream pressure, which in turn cause a decrease in meters maximum operating capacity. Siemens sitrans flow meter positive displacement pd rotary piston. They all share the same principle of operation and are volumetric flow measuring instruments. Positive displacement flow meters, master pd flowmeter. Dec 05, 20 positive displacement flow meter positivedisplaceme ntflowmeter. Rz sanitary positive displacement flowmeter the rz series positive displacement flowmeter is the solution to applications requiring precision flow measurement from a sanitary design. The displacement of the fluid is translated via a magnetic or hall effect pickup into a pulse output that is proportional to the flow.
Principle of operation flow meters and flow computers. Positive displacement flow meter calibration youtube. Jul 31, 2012 the oval gear meters are positive displacement flowmeters where the passage of liquid causes two oval gears to rotate within a precision measuring chamber and with each rotation a fixed volume of liquid passes through the meter. Accuracy and rangeability the accuracy of a meter is defined as the degree to which a meter correctly measures the volume of gas. Positive displacement pd flow meters measure the volumetric flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes finite increments or volumes of the fluid. The blancett positive displacement flow meter provides high measurement accuracy for fluids over a wide viscosity range. Every cycle of the meters mechanism displaces a precisely defined positive quantity of fluid, so that a count of the number of mechanism cycles yields a precise quantity for the total fluid volume passed through the flow meter. Positive displacement flowmeter technology is the only flow measurement technology that directly measures the volume of the fluid passing through the flowmeter. Positive displacement flowmeters achieve this by repeatedly entrapping fluid in order to measure its flow. Flow measurement is the process of measuring fluid in your plant or industry. Positive displacement flowmeters, also know as pd meters, measure volumes of fluid flowing through by counting repeatedly the filling and discharging of known fixed volumes. The oval rotor principle has proven to be a reliable and highly accurate method of measuring flow.
About positive displacement flow meters instrumart. Industrial flow measurement basics and practice abb group. Positive displacement flow meters measure the volumetric flow rate of a moving fluid or gas by way of precisionfitted gears or rotors containing cavities through which precisely known volumes of fluid pass. By directing the fluid to mechanically displace components in the meter in. Positive displacement flow meter, jsn positive displacement. A typical positive displacement flowmeter comprises a chamber that obstructs the flow. Sep 15, 2015 positive displacement flow meter don oval gear flowmeters are categorized as positive displacement flow technology. Impact of viscosity and flow range on meter accuracy accuracy % for viscosities greater than cps.
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